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A micro/nano co-doping epoxy/boron nitride (BN) composite was prepared using micro-BN and nano-BN as fillers, and the variations of thermal conductivity and breakdown characteristics of the epoxy composites with the nano-BN doping content were studied when the total doping content of BN was fixed. The results show that when the total mass fraction of BN is 20%, with the increase of nano-BN doping content, the thermal conductivity of the composite decreases slightly, the power frequency electric strength increases at first and then decreases, and the endurance time of the sample with thickness of 0.2 mm is shortened under the bipolar square wave voltage of 8 kV and 25 kHz. The thermal conductivity of the epoxy composite doped with pure micro-BN is the largest (0.83 W/(m·K)), and its endurance time is the longest (193 s) under high frequency bipolar square wave voltage, which are 277% and 408% higher than that of pure epoxy resin, respectively. When the mass fraction of nano-BN is 1%, the power frequency electric strength of the epoxy composite is the highest (131 kV/mm), which is 27% higher than that of pure epoxy resin. Therefore, for the micro/nano co-doping epoxy composite system, the addition of nanoparticles can improve the power frequency electric strength of composite, but it will reduce the thermal conductivity of the composites and shorten the withstand time under high frequency bipolar square wave voltage.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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